<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link href="css/register.css" rel="stylesheet">
</head>
<body>
<div class="form-div">
    <div class="reg-content">
        <h1>欢迎注册</h1>
        <span>已有帐号？</span> <a href="#">登录</a>
    </div>
    <form id="reg-form" action="#" method="get">

        <table>

            <tr>
                <td>用户名</td>
                <td class="inputs">
                    <input name="username" type="text" id="username">
                    <br>
                    <span id="username_err" class="err_msg" style="display: none">用户名不太受欢迎</span>
                </td>

            </tr>

            <tr>
                <td>密码</td>
                <td class="inputs">
                    <input name="password" type="password" id="password">
                    <br>
                    <span id="password_err" class="err_msg" style="display: none">密码格式有误</span>
                </td>
            </tr>


            <tr>
                <td>手机号</td>
                <td class="inputs"><input name="tel" type="text" id="tel">
                    <br>
                    <span id="tel_err" class="err_msg" style="display: none">手机号格式有误</span>
                </td>
            </tr>

        </table>

        <div class="buttons">
            <input value="注 册" type="submit" id="reg_btn">
        </div>
        <br class="clear">
    </form>

</div>

<script>
//1.验证用户名是否符合规则
//1.1获取用户名的输入框
var usernameInput = document.getElementById("username");

//1.2绑定onblur事件 失去焦点
usernameInput.onblur= checkUsername;
    function checkUsername (){
    var username=usernameInput.value.trim();

    var reg=/^\w{6,12}$/;
    var flag=reg.test(username);
    //var flag=username.length > 6 && username.length <= 12;
    //1.4判断用户名是否符合规则：长度6~12
    if (flag) {
        //符合规则
        document.getElementById("username_err").style.display='none';
    }else{
        //不符合规则
        document.getElementById("username_err").style.display='';
    }
    return flag;
}
//
var passwordInput = document.getElementById("password");

//1.2绑定onblur事件 失去焦点
passwordInput.onblur= checkPassword;
    function checkPassword (){
    var password=passwordInput.value.trim();
        var reg=/^\w{6,12}$/;
        var flag=reg.test(password);
    //var flag=password.length > 6 && password.length <= 12;
    //1.4判断用户名是否符合规则：长度6~12
    if (flag) {
        //符合规则
        document.getElementById("password_err").style.display='none';
    }else{
        //不符合规则
        document.getElementById("password_err").style.display='';
    }
    return flag;
}



var telInput = document.getElementById("tel");

//1.2绑定onblur事件 失去焦点
telInput.onblur= checkTel;
    function checkTel(){
    var tel=telInput.value.trim();

        var reg=/^[1]\d{10}$/;
        var flag=reg.test(tel);
    //1.4判断用户名是否符合规则：长度6~12
    if (flag) {
        //符合规则
        document.getElementById("tel_err").style.display='none';
    }else{
        //不符合规则
        document.getElementById("tel_err").style.display='';
    }
    return flag;
}


//1.获取表单对象
var regForm = document.getElementById("reg-form");
//2.绑定onsubmit 事件
regForm.onsubmit=function () {
    //挨个判断每个表单项是否都符合要求，如果有一个不符合则返回false
    var flag = checkUsername() && checkPassword() && checkTel();
    return flag;
}
</script>
</body>
</html>